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PDF AP3105L Data sheet ( Hoja de datos )
| Número de pieza | AP3105L | |
| Descripción | High Voltage Green Mode PWM Controller | |
| Fabricantes | BCD | |
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Application Note 1062
High Voltage Green Mode PWM Controller AP3105
1. Introduction
The AP3105 is a low start-up current, current mode
PWM controller with green-mode power-saving
operation. Different from AP3103, AP3105 PWM
switching frequency at normal operation is fixed at
65kHz dithering with a narrow range. The difference
between AP3103/AP3105 is shown in Table 1. The
dithering of frequency will improve EMI feature.
When the load decreases, the frequency will reduce
and when at a very low load, the IC will enter the
“burst mode” to minimize switching loss. A
minimum 20kHz frequency switching is to avoid the
audible noise as well as reducing the standby loss. A
so-called VCC Maintain Mode is applied under light
load to realize a stable output and to reduce the loss
on the start-up resistor. The standby power of the
system using AP3105 can be reduced to 60mW at
230V input.
AP3103
AP3105
Frequency
Adjustable
Fixed at 65kHz
VFB Resistor
4.5kΩ
10kΩ
Standby
Performance
External Protection
VCC OVP
OLP & FOCP
Better
NA
Auto-recoverable
Auto-recoverable
Best
By “CTRL” pin
Latch
/Auto-recoverable
Latch
/Auto-recoverable
Table 1. The Difference between AP3103/AP3105
The AP3105 integrates a lot of functions such as the
Lead Edge Blanking (LEB) of the current sensing,
internal slope compensation and several protection
features which include cycle-by-cycle current limit
(OCP), fast OCP (FOCP), VCC over voltage
protection, OTP, OLP protection. The “CTRL” pin is
designed for customers to add external protection
functions such as OVP and OTP.
The AP3105 is specially designed for off-line
AC-DC power supply, such as LCD monitors,
notebook adapter and battery charger applications. It
can offer the designers a cost effective solution while
keeping versatile protection features. The IC uses
SOT-23-6 package type to realize its compact size.
This application note includes detailed explanation of
the IC’s major functions, some considerations about
Prepared by Wu Qikun
System Engineering Dept.
the PCB layout, and methods for reducing the
standby power loss, and finally presents a demo
design of a 12V 1A adaptor.
2. Function Description
2.1 CTRL Pin
For some applications, the system requires external
programmable protection function. The CTRL pin
has two kinds of modes to trigger the protection: high
level trigger and low level trigger. The low threshold
voltage is 0.5V and high threshold is 2.5V. When the
CTRL pin voltage is lower than 0.5V or higher than
2.5V, latch or auto-restart protection will be triggered
(different versions of 3105 offer different protection
combination, which is shown in Table 2).
Version VCC OVP
OLP&
FOCP
CTRL(low) CTRL(high)
AP3105
Auto-
recoverable
Auto-
recoverable
Latch
Auto-
recoverable
AP3105V
Latch
Auto-
recoverable
Latch
Latch
AP3105L
Latch
Latch
Latch
Latch
AP3105R
Auto-
recoverable
Auto-
recoverable
Auto-
recoverable
Latch
Table 2. Version Classification of AP3105
CTRL pin voltage maintains 1.6V if the pin is
floating, so leave CTRL pin open if the designer does
not need this function. Once the latch protection is
triggered, the bulk capacitor will provide the energy
to the IC through start-up resistor to ensure the IC
disable the output signal (latch mode). This mode
will not be released until the AC input is shut off.
Therefore, the de-latch time is mainly depending on
the value of HV startup bulk capacitor. If the system
needs a short de-latch time, it is better for the startup
resistor to take power from the point before the
rectifier bridge. Typical application of CTRL pin is
shown in Figure 1.
Note:
1. The sink current to the CTRL pin should be lower
than 5mA by selecting a proper pull up resistor.
2. If the designer needs to apply a bypass capacitor
on CTRL pin, the capacitor should not be more than
1nF.
Apr. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
1 page  
Application Note 1062
Input Voltage
Input Power
90Vac/60Hz
0.032W
115Vac/60Hz
0.0345W
180Vac/50Hz
0.0463W
230Vac/50Hz
0.0605W
264Vac/50Hz
0.0742W
Table 3. Test Result
R1,R2
RES,1206,510K,J
R3 RES,1206,10Ω,J
R4 RES,1206,0Ω,J
R5 RES,1206,1.5Ω,F
R6 RES,1206,10Ω,F
R7,R10
RES,1206,1.5M,J
R8 RES,0603,1K,J
R9 RES,0603,10K,J
R11 RES,0805,10Ω,J
R12 RES,0603,24K,F
R13 RES,0603,5.6K,J
R14 RES,0603,100K,J
R15 RES,0603,91K,F
R16 RES,0805,0Ω,J
R18 RES,1206,3K,J
J1 BASE,3.96mm,3PIN,3N2
J2 BASE,3.96mm,2PIN
T1 X'FM,EF-20,102Ts,1.6mH
Q1
MOSFET-N,
1A,600V,TO-251,STD1NA60
2
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
C1 CAP,Y1,1000pF,250V
C2,C3
CAP,AL,10µF,400V,Φ10mm,
Rubycon, YXA, 105°C
C4 CAP,CD,222M,1KV
C5,C6
C7
C8
CAP,Low ESR,
AL,470µF,16V,Φ8mm, CapXon, LZ
CAP,AL,2.2µF,50V,Φ6.3mm,
Rubycon,YXF
CAP,AL,22µF,50V,Φ6.3mm,
Rubycon,YXF
C9 CAP,0805,102,100V,J
1
2
1
2
1
1
1
C11 CAP,0603,151,50V,J 1
C13 CAP,0603,683,50V,J 1
C14 CAP,0603,222,50V,J 1
D1~D6 DIODE,1N4007,1A,1000V,DO-41
6
D7,D8 DIODE,1N4148,0.15A,100V,LL-34
D9
DIODE,SCHOTTKY,SB3100,
3A,100V,DO-201
U1 IC,PWM,AP3105,SOT-23-6,BCD
U2
IC,OPTO
COUPLER,PC817B,DIP-4
U3 IC,AS431I,TO-92,BCD
2
1
1
1
1
F1 FUSE,CUBIFORM,SLOW,1A,250V 1
L2
CHOKE,FER,DR6*8,1.5mH, 0.3A,
Φ6mm
1
L3
CHOKE,2.2µH
1
Apr. 2011 Rev. 1. 0
Table 4. BOM of DEMO BOARD (12V/1A)
BCD Semiconductor Manufacturing Limited
5
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| PDF Descargar | [ Datasheet AP3105L.PDF ] | |
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